Hello, I can verify the bug #252571. Konqueror hangs on exit (the Window disappears, but the process is still there), blocking the umount command. Killing the konqueror process solves the problem, but I do not want to let a newbie near this system.
BTW, I think submount or supermount would not care about programs still accessing the cdrom. (20 dead konqerors are not the big problem for a user, but no access to the cdrom is a problem) Keep up the good work, I am looking forward to the day I can make the full switch to debian (I am still on Mandrake :-( ). Best regards, Gerald